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4(x+2y)^-9(x-y)^怎么算
人气:326 ℃ 时间:2020-06-06 20:07:17
解答
题目应是4(x+2y)^2-9(x-y)^2
=(2(x+2y)+3(x-y))(2(x+2y)-3(x-y))
=(5x+y)(-x+7y)
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